Gen. David Petraeus is expected to plead guilty to federal charges to end a probe into whether he provided classified information to his mistress when he was CIA chief, according to a U.S. official briefed on the matter.

Boko Haram, the Islamist extremist group already blamed for numerous horrific attacks in West Africa, posted a graphic video online Monday showing the apparent beheadings of two men who the group said were suspected spies.